Ignition machine



March 8 1927.

F. BILLON ET AL IGNITION MACHINE Filed Aug. 16, 1926 ggy/ n amf Patented Mar. 8, 1927.

rennet UNITED STATES PATENT "oEFIc FREDERIC BILLON AND JAKOB BOHLT, OF SOLOTHURN, SWITZERLAND, ASSIGNORS' TQ SCINTILLA AKTIENGESELL SCHAFT, F SOLOTHURN, SWITZERLAND.

IGNITION MACHINE.

Application filed August 16, 1926, Serial No. 129,628, and in Germany July 23, [925.

This invention relates to ignition ma-- chines and has for its object to simplify the construction of the stationary part of such machines having a flywheel magnet.

The machines of this kind as made at the present time consist as a rule of one or more laminated iron yokes, on which coils are -mounted. Machines with such u-shaped yokes and three coilsare known, also machines with two separate I-shaped yokes each with a single coil. The former shape is complicated. the three coils which are arranged in a U-shaped manner being in each others way. In the second case the magnetic. circuit is periodically interrupted, which has a detrimental effect on the magnet. Furthermore, these apparatus have laminations which are riveted or screwed together in several places, so that they are complicated and expensive to manufacture.

In the known apparatus the pole pieces and coil cores are as arule different and separate from one another, so that two difi'erent parts have to be made and mounted. In

cult to place the coil on the core.

The object of the present invention is to simplify and cheapen the manufacture as compared with the known arrangements. This is effected by a three-pole "ll-shaped stator bearing two coils being so constructed that a single kind of stamping canbe used both for the pole pieces and for the coil cores. The pole piece sheets are punched out in one piece with the core partand have a recess at one side, into which the core part of the other pole fits, so that the whole stator consists of single sheets which are inserted in one another. By this arrangement a particularly satisfactory magnetic circuit is obtained.

All the laminations of one pole maybe connected together with screws, one screw being used for each pole, sothat the expensive method of riveting is, done away with. The poles or the stator constructed according to the present invention are fixedto the casing preferably also with a single screw.

" Obviously the pole pieces formed at the ends of the built up yoke will be such that Y the sheets are separated from one another by the thickness of a sheet. These spaces may be filled with magnetic material, for instance with a pole piece lamination without a core some other types of apparatus the stators "are made in one piece, which makes it difi'i-.

piece, or with non-magnetic material. This in itself constitutes a considerable simplification in the manufacture, as the same shape of stamping may be used without the core part.

In the accompanying drawing a constructional example of the present invention is shown in perspective view.

Figure 1 shows a single stamping.

Figure 2 shows two layers of stampings adapted to be superposed one on the other are shown, while Figure 3 shows three such superposed layers and two pole piece laminations, without the core part.

Referring to the drawing in detail, each stamping 5 is provided with a core part 7 and a recess 6 into which the core part 7 of the adjacent stamping fits. The stampings are superposed one upon the other as shown in Fig. 3 and may be secured in assembled relation by screws 8 passing through the apertures 9. In Fig. 3, a screw 8 suitable for the purpose is shown in line above one of the apertures 9 for insertion therein.

In Fig. 3, two pole pieces 5 are shown without the core part 6.

l lhat we claim is:

1. ,For use with an ignition machine llflV" ing a rotor in the form of a fly-wheel magnet a stator having three poles, two cores con necting one of the poles with the other two poles and lying at an angle of approximately with respect to one another, each of the said cores being adapted to support a coil.

2. For use with an ignition machine having a rotor in the form of a fly-wheel magnet a stator having three poles, two cores connecting one of the poles with .the other two poles and lying at an angle of approximately 60 with respect to one another, each of the said cores being adapted to support a coil, the said poles and cores being constituted by superposed layers of stampings, each layer comprising three stampings, as set forth.

3. A stator as claimed in claim 2 and in which two of the stampings in each layer comprises a pole portion and a core portion of the stator, as set forth. i

4. A stator as claimed in claim 2 and in which two of the stampings; in each layer comprise a pole. portion and a'core portion of the stator, and-in which adjacent superposed layers are "reversed with respect to one'another, as set forth.

5. A stator as .claimed in claim 2, and having screws for holding the superposed layers of stampings together, one screw being provided for each pole, as set forth.

6. A stator as claimed in claim 2, and in'which two of the stampings in each layer comprise a pole portion and a core portion of the stator, and half the stampings constituting the said other two poles having no core part, as set forth.

In testimony whereof we have signed our names to this specification.

FREDERIG BILLON. ,JAKOB BOHLI. 

